Wound condenser



Jan. 3, 1950 c. DE LANGE I 2,493,231

WOUND CONDENSER Filed Sept. 10, 1946 (ORA EH5 DE LANGE INVENTOR.

AGENT Patented Jan. 3, 1950 WOUND CONDENSER Cornelia de Lange, Eindhoven, Netherlands, as-

signor to Hartford National Bank and Trust Company, Hartford, Conn, as trustee Application September 10, 1946, Serial No. 695,891 In the Netherlands November 12, 1942 Section 1, Public Law 690, August 8', 1946 Patent expires November 12, 1962 1 Claim. 1

The present invention relates to a wound condenser comprising armature parts in the top ends of the winding.

In wound condensers consisting of dielectric foils and metal armatures it is common to provide the armatures in the top ends of the winding. As an alternative they may stand above them, thus permitting the armature parts to be electrically interconnected. This construction is used more particularly for condensers having a low self-induction. Furthermore, the electric resistance is very low so that the loss angle is substantially equal to that of the dielectric. However, the common constructions for the electrical connections of the projecting armature parts leave much to be desired.

German Patent Specification 587,964 divulges a construction where the electrical connection of the armature parts is established by a contact member engaging the top end of the winding. With this connection there is a risk of becoming detached, due to vibration, or of corrosion and consequently of the electrical contact becoming defective. The contact member used in this case, possesses cross-arms which are furnished with incisions. The latter extend parallel with the armature parts. Consequently, on pushing in the contact member a perfect contact will not be made with all armature parts.

British Patent Specification No. 439,665 discloses a construction where a groove is provided in the projecting armature parts of a wound condenser, into which groove solder is poured. Since in this case use is not made of a robust contact member this construction is fragile. Moreover, there is a risk in this case, similarlyto other common constructions for connecting armature parts, of air bubbles, which'escape from the flux or the dielectric, existing at the contact point, by which the electrical contact is greatly contaminated.

The present invention has for its object to give a suitable solution of the said problem, by which the drawbacks of the prior constructions are cured and other advantages are obtained.

According to the invention the contact member establishing the connection between the armature parts located in the top ends of the winding has at least two rims having sharp edges which cut the armature parts, the sharp edges facing the winding and the contact member being secured by soldering, to the projecting armature parts. The sharp edges ensure a perfect contact. Owing to the direction of the sharp edges a perfect contact is established with all armature parts. As a result of soldering the robust contact member to the armature parts it is now rigidly connected thereto. On the occurrence of air bubbles the contact is not jeopardized, since the contact member contacts with the armature parts throughout the sharp edges. In this way, on the one hand, little solder is necessary for establishing of a perfect connection and on the other hand air bulbs cannot settle at the contact point.

In a suitable form of construction according to the invention the contact member has a central portion with a certain number of radially projecting arms each of which exhibit an arched section in a plane normal to their longitudinal direction, the arched side of the said section being remote from the winding. The sides of the arms extending in a longitudinal direction of the latter are possessed of sharp edges which, as a result of the arched arm, are facing the winding and consequently contact with the armatures. This construction-has the advantage of requiring little material and of having a simple shape.

In a preferred embodiment of the invention the contact member is cruciform, and the arms exhibit a V-shaped section in a plane normal to their longitudinal direction. This form of construction offers the advantage of being robust and requiring little material; moreover, there is little reject in mass production. In fact, in punching the contact members having the shape referred to from a plate it is possible for the contactmembers to be punched from this plate in such manner that substantially no material is lost.

The contact members referred to above may at the same time act as supply conductors. The supply wires may be clamped on them or soldered to them, but in this case a solder must be used having a lower melting point than that which is used for securing a contact member to the armature parts.

In an advantageous form of construction according to the invention the contact members are equipped with tags for connecting the supply conductors. To these contact tags may be soldered the supply wires, in which case special solder need not be used.

The invention will be more fully explained by reference to the accompanying drawing, given by way of example.

The sole figure represents a condenser according to the invention.

The wound condenser I is possessed of armature parts located at the top ends of the winding. In the drawing the upper end of the winding is shown, where are provided the armature parts 2,

The latter are electrically interconnected through the intermediary of the cruciform contact member I. The arms have a V-shaped arched section in a plane normal to its longitudinal direction. In the drawing this is illustrated at the ends 4 and 5. In this way both of the sharp edges 8 and I of each arm are resting on the armature parts. In order to ensure a perfect contact the contact member is pushed with a certain force against the armature parts and soldered in this position, the vair bubbles being enabled to escape either directly to the outside or, through the intermediary of the uninterrupted space, available above the armature parts in each arm, or through holes 9 l0, ll, I2 in the arms. The contact member is equipped with a contact tag 8 and is preferably made simultaneously therewith by punching or stamping from a flat plate.

When the armature parts do not stand above the top end of the winding it is advisable that, before providing the contact member, these armature parts should be metallically interconnected by means of one of the common methods e. g. by means of Schoops method.

The invention greatly facilitates the manufacture of wound condensers having a low inductance and a small loss angle, notably in mass production, and permits the favourable properties to be conserved during the whole of their life.

the opening or the V-shaped section turned toward the armature'parts and having sharp cutting edges penetrating into the armature parts and solderably secured thereto.

CORNELIB m: LANGE.

REFERENCES CITED following references are of record in the file of this patent:

UNITED STATES PA'I'E'NIS Number Name Date 1,726,774 Sullivan Sept. 3, 1929 1,948,506 Caine Feb. 2'7, 1934 FOREIGN PATENTS Number Country Date 306,100 Great Britain Nov. 21, 1929 439,665 Great Britain Dec. 11, 1935 728,297 France May 26, 1932 

